Originally Posted by
ou81two
.... Now for this reservation I'm being asked to participate in Mastercard's "SecureCode" program where I have to give a bunch of data like last 4 of SSN, billing zip code, etc. .....
The VISA program like this is run by the credit card not by UA. The credit card back is the holder of the info, not UA. Once signed up, you just need to provide code / password. It seems to be an increase in security, at least for my VISA card.